Multiplicity dependence of charged-particle jet production in pp collisions at $\sqrt{s} = 13$ TeV
Multiplicity dependence of charged-particle jet production in pp collisions at $\sqrt{s} = 13$ TeV
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DOI：
10.1140/epjc/s10052-022-10405-x
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发表时间：
2022-02
期刊：
影响因子：
--
通讯作者：
Alice Collaboration
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文献类型：
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作者：
Alice Collaboration
首次研究了质心能量为中心的PP碰撞中喷流产生的多重数依赖关系。使用分辨率参数从0.2到0.7变化的反算法，从带电粒子重建喷流。喷流是在赝快度区和横向动量区测量的。多重数间隔由Alice前向检测器V0分类。将带电粒子喷注的微分截面与前级(LO)和次前级(NLO)微扰量子色动力学(PQCD)计算进行了比较。结果表明，尽管NLO预测高估了下方的射流截面，但NLO计算对数据有较好的描述。还测量了不同Re的截面积比，并与模型计算进行了比较。这些测量提供了对喷流破碎的角度依赖性的洞察。喷流产额随自归一化带电粒子多重数的增加而增加。在最高多重数时，这种增加只表现出对喷流横向动量和分辨率参数的微弱依赖。虽然目前版本的《皮提亚》定性地描述了这种行为，但定量描述可能需要实现在强子碰撞中产生多粒子的新机制。
The multiplicity dependence of jet production in pp collisions at the centre-of-mass energy ofis studied for the first time. Jets are reconstructed from charged particles using the anti-algorithm with resolution parametersRvarying from 0.2 to 0.7. The jets are measured in the pseudorapidity rangeand in the transverse momentum range. The multiplicity intervals are categorised by the ALICE forward detector V0. Thedifferential cross section of charged-particle jets are compared to leading order (LO) and next-to-leading order (NLO) perturbative quantum chromodynamics (pQCD) calculations. It is found that the data are better described by the NLO calculation, although the NLO prediction overestimates the jet cross section below. The cross section ratios for differentRare also measured and compared to model calculations. These measurements provide insights into the angular dependence of jet fragmentation. The jet yield increases with increasing self-normalised charged-particle multiplicity. This increase shows only a weak dependence on jet transverse momentum and resolution parameter at the highest multiplicity. While such behaviour is qualitatively described by the present version of PYTHIA, quantitative description may require implementing new mechanisms for multi-particle production in hadronic collisions.